Dynamic nuclear polarization experiments at 14.1 T for solid-state NMR
Physical Chemistry Chemical Physics2010Vol. 12(22), pp. 5799–5799
Citations Over TimeTop 10% of 2010 papers
Yoh Matsuki, Hiroki Takahashi, K. Ueda, T. Idehara, I. Ogawa, Mitsuru Toda, Hideo Akutsu, Toshimichi Fujiwara
Abstract
Instrumentation for high-field dynamic nuclear polarization (DNP) at 14.1 T was developed to enhance the nuclear polarization for NMR of solids. The gyrotron generated 394.5 GHz submillimeter (sub-mm) wave with a power of 40 W in the second harmonic TE(0,6) mode. The sub-mm wave with a power of 0.5-3 W was transmitted to the sample in a low-temperature DNP-NMR probe with a smooth-wall circular waveguide system. The (1)H polarization enhancement factor of up to about 10 was observed for a (13)C-labeled compound with nitroxyl biradical TOTAPOL. The DNP enhancement was confirmed by the static magnetic field dependence of the NMR signal amplitude at 90 K. Improvements of the high-field DNP experiments are discussed.
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